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  <title>为一个类创建别名</title>

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</div><hr /><div id="function.class-alias" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">class_alias</h1>
  <p class="verinfo">(PHP 5 &gt;= 5.3.0)</p><p class="refpurpose"><span class="refname">class_alias</span> &mdash; <span class="dc-title">为一个类创建别名</span></p>

 </div>
 <div class="refsect1 description" id="refsect1-function.class-alias-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="type">bool</span> <span class="methodname"><strong>class_alias</strong></span>
    ( <span class="methodparam"><span class="type">string</span> <code class="parameter">$original</code></span>
   , <span class="methodparam"><span class="type">string</span> <code class="parameter">$alias</code></span>
   [, <span class="methodparam"><span class="type">bool</span> <code class="parameter">$autoload</code><span class="initializer"> = <strong><code>TRUE</code></strong></span></span>
  ] )</div>

  <p class="para rdfs-comment">
   基于已定义的类 <em><code class="parameter">original</code></em> 创建别名 <em><code class="parameter">alias</code></em>。
   这个别名类和原有的类完全相同。
  </p>
 </div>

 <div class="refsect1 parameters" id="refsect1-function.class-alias-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    
     <dt>
<em><code class="parameter">original</code></em></dt>

     <dd>

      <p class="para">
       原有的类。
      </p>
     </dd>

    
    
     <dt>
<em><code class="parameter">alias</code></em></dt>

     <dd>

      <p class="para">
       类的别名。
      </p>
     </dd>

    
    
     <dt>
<em><code class="parameter">autoload</code></em></dt>

     <dd>

      <p class="para">
       如果原始类没有加载，是否使用自动加载（autoload）。
      </p>
     </dd>

    
   </dl>

  </p>
 </div>

 <div class="refsect1 returnvalues" id="refsect1-function.class-alias-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   成功时返回 <strong><code>TRUE</code></strong>， 或者在失败时返回 <strong><code>FALSE</code></strong>。
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-function.class-alias-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-4943">
    <p><strong>Example #1 <span class="function"><strong>class_alias()</strong></span> 例子</strong></p>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /><br /></span><span style="color: #007700">class&nbsp;</span><span style="color: #0000BB">foo&nbsp;</span><span style="color: #007700">{&nbsp;}<br /><br /></span><span style="color: #0000BB">class_alias</span><span style="color: #007700">(</span><span style="color: #DD0000">'foo'</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'bar'</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$a&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;</span><span style="color: #0000BB">foo</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$b&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;</span><span style="color: #0000BB">bar</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">//&nbsp;the&nbsp;objects&nbsp;are&nbsp;the&nbsp;same<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$a&nbsp;</span><span style="color: #007700">==&nbsp;</span><span style="color: #0000BB">$b</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$a&nbsp;</span><span style="color: #007700">===&nbsp;</span><span style="color: #0000BB">$b</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$a&nbsp;</span><span style="color: #007700">instanceof&nbsp;</span><span style="color: #0000BB">$b</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">//&nbsp;the&nbsp;classes&nbsp;are&nbsp;the&nbsp;same<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$a&nbsp;</span><span style="color: #007700">instanceof&nbsp;</span><span style="color: #0000BB">foo</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$a&nbsp;</span><span style="color: #007700">instanceof&nbsp;</span><span style="color: #0000BB">bar</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$b&nbsp;</span><span style="color: #007700">instanceof&nbsp;</span><span style="color: #0000BB">foo</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$b&nbsp;</span><span style="color: #007700">instanceof&nbsp;</span><span style="color: #0000BB">bar</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

    <div class="example-contents"><p>以上例程会输出：</p></div>
    <div class="example-contents screen">
<div class="cdata"><pre>
bool(true)
bool(false)
bool(true)
bool(true)
bool(true)
bool(true)
bool(true)
</pre></div>
    </div>
   </div>
  </p>
 </div>

 <div class="refsect1 seealso" id="refsect1-function.class-alias-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="function.get-parent-class.html" class="function" rel="rdfs-seeAlso">get_parent_class()</a> - 返回对象或类的父类名</span></li>
    <li class="member"><span class="function"><a href="function.is-subclass-of.html" class="function" rel="rdfs-seeAlso">is_subclass_of()</a> - 如果此对象是该类的子类，则返回 TRUE</span></li>
   </ul>
  </p>
 </div>

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